Pincho de tortilla is a traditional appetizer or bar snack originating from Basque Country. This classic pincho is made with Spanish tortilla omelet, which is nothing like the Mexican one – it's a cross between scrambled eggs and a crustless potato pie.
The ingredients include potatoes, onions, milk, eggs, olive oil, and seasonings. The potatoes are sautéed in olive oil with the onions until both begin to soften, and the eggs are then scrambled in the same pan until the whole mixture becomes firm and fully cooked.